Overview of the large helical device project

A. Iiyoshi, A. Komori, A. Ejiri, M. Emoto, H. Funaba, M. Goto, K. Ida, Hiroshi Idei, Inagaki Shigeru, S. Kado, O. Kaneko, K. Kawahata, T. Kobuchi, S. Kubo, R. Kumazawa, al et al

Research output: Contribution to journalArticle

190 Citations (Scopus)

Abstract

The Large Helical Device (LHD) has successfully started running plasma confinement experiments after a long construction period of eight years. During the construction and machine commissioning phases, a variety of milestones were attained in fusion engineering which successfully led to the first operation, and the first plasma was ignited on 31 March 1998. Two experimental campaigns were carried out in 1998. In the first campaign, the magnetic flux mapping clearly demonstrated a nested structure of magnetic surfaces. The first plasma experiments were conducted with second harmonic 84 and 82.6 GHz ECH at a heating power input of 0.35 MW. The magnetic field was set at 1.5 T in these campaigns so as to accumulate operational experience with the superconducting coils. In the second campaign, auxiliary heating with NBI at 3 MW has been carried out. Averaged electron densities of up to 6 × 1019 mMIN3, central temperatures ranging from 1.4 to 1.5 keV and stored energies of up to 0.22 MJ have been attained despite the fact that the impurity level has not yet been minimized. The obtained scaling of energy confinement time has been found to be consistent with the ISS95 scaling law with some enhancement.

Original languageEnglish
Pages (from-to)1245-1256
Number of pages12
JournalNuclear Fusion
Volume39
Issue numberSpecial Issue
Publication statusPublished - Sep 1999
Externally publishedYes

Fingerprint

flux mapping
heating
plasma control
scaling laws
magnetic flux
coils
fusion
engineering
harmonics
scaling
impurities
energy
augmentation
magnetic fields
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Nuclear and High Energy Physics

Cite this

Iiyoshi, A., Komori, A., Ejiri, A., Emoto, M., Funaba, H., Goto, M., ... et al, A. (1999). Overview of the large helical device project. Nuclear Fusion, 39(Special Issue), 1245-1256.

Overview of the large helical device project. / Iiyoshi, A.; Komori, A.; Ejiri, A.; Emoto, M.; Funaba, H.; Goto, M.; Ida, K.; Idei, Hiroshi; Shigeru, Inagaki; Kado, S.; Kaneko, O.; Kawahata, K.; Kobuchi, T.; Kubo, S.; Kumazawa, R.; et al, al.

In: Nuclear Fusion, Vol. 39, No. Special Issue, 09.1999, p. 1245-1256.

Research output: Contribution to journalArticle

Iiyoshi, A, Komori, A, Ejiri, A, Emoto, M, Funaba, H, Goto, M, Ida, K, Idei, H, Shigeru, I, Kado, S, Kaneko, O, Kawahata, K, Kobuchi, T, Kubo, S, Kumazawa, R & et al, A 1999, 'Overview of the large helical device project', Nuclear Fusion, vol. 39, no. Special Issue, pp. 1245-1256.
Iiyoshi A, Komori A, Ejiri A, Emoto M, Funaba H, Goto M et al. Overview of the large helical device project. Nuclear Fusion. 1999 Sep;39(Special Issue):1245-1256.
Iiyoshi, A. ; Komori, A. ; Ejiri, A. ; Emoto, M. ; Funaba, H. ; Goto, M. ; Ida, K. ; Idei, Hiroshi ; Shigeru, Inagaki ; Kado, S. ; Kaneko, O. ; Kawahata, K. ; Kobuchi, T. ; Kubo, S. ; Kumazawa, R. ; et al, al. / Overview of the large helical device project. In: Nuclear Fusion. 1999 ; Vol. 39, No. Special Issue. pp. 1245-1256.
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